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A method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals

A technology of ammonium paratungstate and control method, which is applied in the control field of crystallization process of ammonium paratungstate with small particle size, to achieve obvious effects, increase the number of crystal nuclei to be precipitated, and ensure consistency

Active Publication Date: 2019-01-04
江西省修水赣北钨业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of existing crystallization technology is more focused on the reduction of energy consumption in the crystallization process, the automatic control of the process, and the influence of the speed of stirring speed on the crystals, and little attention is paid to the solution after changing the stirring speed in different periods during the entire crystallization process. Changes in properties of crystals precipitated in the crystallizer

Method used

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  • A method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals
  • A method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals
  • A method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals

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Experimental program
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Effect test

Embodiment 1

[0037] will be 8m 3 Ammonium tungstate solution was added to 10m 3 In the crystallizer, carry out evaporative crystallization according to the step of following segmental evaporative crystallization, the concrete steps of described segmental evaporative crystallization are:

[0038] a. Heating the ammonium tungstate solution to 60°C;

[0039] b. Control the temperature at 60°C, set the stirring speed at 45r / min, and keep it for 1.5 hours;

[0040] c. Control the temperature at 65°C, set the stirring speed at 45r / min, and keep it for 1.5 hours;

[0041] d. Control the temperature at 70°C, set the stirring speed at 45r / min, and keep it for 1.5 hours;

[0042] e. Control the temperature at 60° C., set the stirring speed at 45 r / min, and keep it for 1.5 hours.

[0043] Ammonium paratungstate crystal 1 was obtained by drying the evaporated and crystallized crystals.

Embodiment 2

[0045] will be 8m 3 Ammonium tungstate solution was added to 10m 3 In the crystallizer, carry out evaporative crystallization according to the step of following segmental evaporative crystallization two, the specific steps of described segmental evaporative crystallization two are:

[0046] a. Heating the ammonium tungstate solution to 60°C;

[0047] b. Control the temperature at 60°C, set the stirring speed at 15r / min, and keep it for 1.5 hours;

[0048] c. Control the temperature at 65°C, set the stirring speed at 25r / min, and keep it for 1.5 hours;

[0049] d. Control the temperature at 72°C, set the stirring speed at 35r / min, and keep it for 1.5 hours;

[0050] e. Control the temperature at 62° C., set the stirring speed at 45 r / min, and keep it for 1.5 hours.

[0051] Ammonium paratungstate crystal 2 was obtained by drying the evaporated and crystallized crystals.

Embodiment 3

[0053] will be 8m 3 Ammonium tungstate solution was added to 10m 3 In the crystallizer, carry out evaporative crystallization according to the step of following segmental evaporative crystallization three, the concrete steps of described segmental evaporative crystallization three are:

[0054] a. Heating the ammonium tungstate solution to 60°C;

[0055] b. Control the temperature at 60°C, set the stirring speed at 45r / min, and keep it for 0.8 hours;

[0056] c. Control the temperature at 62°C, set the stirring speed at 40r / min, and keep it for 0.6 hours;

[0057] d. Control the temperature at 65°C, set the stirring speed at 35r / min, and keep it for 1.3 hours;

[0058] e. Control the temperature at 68°C, set the stirring speed at 30r / min, and keep it for 1 hour;

[0059] f. Control the temperature at 72°C, set the stirring speed at 25r / min, and keep it for 0.7 hours;

[0060] g. Control the temperature at 64°C, set the stirring speed at 20r / min, and keep it for 0.5 hours;...

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Abstract

The invention discloses a control method for a crystallizing process of producing small-size ammonium paratungstate crystals. The control method is characterized by adding an ammonium paratungstate solution into a crystallizer for carrying out fractional evaporative crystallization; the fractional evaporative crystallization comprises the specific steps in the description; through steps a to h, the fractional evaporative crystallization of producing the small-size ammonium paratungstate crystals is completed by combining four stages of preliminary concentration, crystal nucleus separation, crystal growth and crystal aging during a solution crystallization process and seven time segments in steps b to h. The control method disclosed by the invention is simple and practical, and meanwhile, the effect is obvious; crystal growth is accurately affected just by controlling stirring time, the stirring speed and the stirring temperature, so that the purpose of controlling final crystal performance is achieved, production of the small-size ammonium paratungstate crystals is realized, and produced small-size ammonium paratungstate crystals are good in consistency.

Description

technical field [0001] The invention belongs to the field of tungsten smelting and processing, and in particular relates to a method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals. Background technique [0002] Tungsten is a metallic element with an atomic number of 74 and an atomic weight of 183.84. Elemental tungsten is steel-gray or silver-white, with high hardness and high melting point, and is not eroded by air at room temperature; it is mainly used for manufacturing filaments, high-speed cutting alloy steel and superhard molds, and is also used for optical instruments and chemical instruments. [0003] Tungsten is a non-ferrous metal and an important strategic metal. Tungsten ore was called "heavy stone" in ancient times. In 1781, Swedish chemist Carl William Scheele discovered scheelite and extracted a new elemental acid - tungstic acid. In 1783, wolframite was discovered by the Spaniard De Puyal and tungstic a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00B01D9/02B01D1/26B01D1/00
CPCB01D1/0082B01D1/26B01D9/0018B01D9/0031B01D2009/0086C01G41/00
Inventor 李军丁伟邱友红夏瑜夏金龙
Owner 江西省修水赣北钨业有限公司